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JEECUP (UP Polytechnic) Potentiometer — practice questions

Explore 2 free Potentiometer questions in JEECUP (UP Polytechnic) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Potentiometer questions and exercises with answers

Showing questions 1–2 of 2.

The **potential gradient** $K$ along a uniform potentiometer wire is defined as:Read the answer and worked solution →An **ideal voltmeter** measuring a potential difference should have:Read the answer and worked solution →

Worked practice questions

The **potential gradient** $K$ along a uniform potentiometer wire is defined as:

  1. Current per unit length
  2. Resistance per unit length
  3. Potential difference per unit length of the wire
  4. EMF per unit area
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Correct answer: C. Potential difference per unit length of the wire

$K = V_{AB}/L$ — potential drop per unit length along the wire. For a steady current and uniform wire, $K$ is constant and the potential at a point at distance $\ell$ from A is $V = K\ell$.

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An **ideal voltmeter** measuring a potential difference should have:

  1. Resistance equal to the source
  2. Resistance equal to the load
  3. Zero resistance
  4. Infinite resistance so it draws no current
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Correct answer: D. Infinite resistance so it draws no current

An ideal voltmeter draws zero current, so it does not disturb the circuit being measured — this requires infinite internal resistance. A potentiometer acts like an ideal voltmeter at the null point.

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